Ventilator.



R. F. HUNTER.

VBNTILATOR.

APPLICATION FILED APB.13,1908.

909,601 Patented Jan. 12, 1909.

WITNESS/5 ENTOH Q Eur/Earl? H UN TEE 0 i" QFW B UNITED sT'ATEs ArnnirSpecification of intent.

Tatented $9.11.. 12, 19.09.

Application-med e it .13, 1908. s arch. 496,809.

To all-'whom-itmay concern-z Be it' known that 1, ROBERT F. Hnnrnmacitizen of the United States, and a' resident of Bellefonte, in thecounty of Center and State of Pennsylvania, have-made certain new anduseful-Improvements in Ventilators, of which the following is aspecification.

My invention is an improvement 'in ventilators, and consists in certainnovel constructions and combinations of parts hereinafter described andclaimed.

' Referring to the drawings forming a part hereofigure l is a section onthe line 1- 1 of Fig. 2, and Fig. 2 is a section on the line 2--2 ofFig. 1. The present embodiment of the invention,

comprises a casing or box 1, substantially' rectangular in crosssection, open at its top 'asat 2, and provided with a side opening 3.,the casing being provided with a lateral extension 4 at the sideopening, which extension is adapted to be inserted in a windowcasementjbetween the sash and the sill, the casing being arranged insideof the room to be ventilated, and the top and the bottom of theextension are each provided with a felt .cushion 5, for engagement bythe sash and the sill. A shield 6 is provided at the top of the lateralextension, and'screens 7 and 8 are arranged at the top and the sideopening respectively.

A damper 9 is provided with trunnions 10, which are journaled in thesides of the casing, the damper being of a width equal to the width ofthe casing, and of a length to extend thereacross when in closedposition, as shown in dotted lines in Fig. 1. The upper and the lowerends of the damper are bent at an angle to the'body portion thereof asat 11, whereby to flatly engage the-sides of the casing, and cushions offelt 12 are pro- Vilied for engagement by the said bent ends.

The trunnions 10 are arranged above the center of the damper, so thatthe said damper normally stands in the position shown in full lines inFig. 1, and means are provided for varying the angle of inclination ofthe damper, whereby to close the opening of the casing to a greater orless extent.

The above mentioned means comprises a rod 13, having its ends insertedin horizon tal slots 14 in the sides of the casing, and the said rod isadapted to be moved nearer to or farther away from the window casement,whereby to cause the damper to stand in a more or less inclinedposition, thereby varying the extent of the clear passage through thecasing. I The purpose ofthe invention, is to furnish a-self regulatingventilator, one which will admit an ordinary current of air, but willprevent the entrance of strong currents. An ordinary current of airpassing in the direction of the arrows shown in Fig. 1, will have noeflect on the damper, but should a stronger current take place, thedamper will be swung into one of the positions shown in dotted lines,depending upon the strength of the said current, a s'trong currentcompletely closing the damper. By arranging the weight of the damper inaccordance with the end to be attained, the ventilatormay be constructedto close at ,a predetermined strength of current; The amount of dustpassing with the air will be diminished, for the reason that dust isusually carried in high winds, and high winds willv close theventilator, while. a

wind above normal velocity will so deflect I the damper as to throw theparticles of dust downward. The screens also act to diminish the dust.

By the use of the operating'rod 13, the

maximum opening of the damper may be determined, without in any wayinterfering with the automatic principle of the damper, and the rod isalso used to retain the damper in closed position. It will be observedthat only the lower portion of, the damper, that is, that portion belowthe trunnions is exposed to the direct current of the air as itentersfrom the outside, and enough force is exerted by such direct current toovercome any counteracting effect of the currents in front of and belowthe damper. The more the damper'is deflected by an increase in velocityof said air current, the more said current is deflected inward towardthe windowpane, thus further insuring the drafts from extending awayfrom the window. It will be understood that the damper is held closed,

so long as suflicient velocity and wind prcssure is present, butgradually takes the open positionas the pressure decreases, thuspreventing admission of dust and maintaining an even volume of air. Itwill be noticed that the trunnions are provided with shoal ders 10, toprevent the side edges of the damper from rubbing the sides of thecasing.

I claim 1. A. ventilator comprising a casing open at its top and havinga side opening, the

casing being provider] with a lateral extension at the side openingadapted to be inserted in a window casement between the sash and thesill, the top and the bottom of the extension having cushions of feltfor engagement by the sash and the sill, a damper comprising a plate ofsheet material provided with trunnions engaging the sides of the casing,the trunnions being arranged nearer to the top of theplate than to thebottom, the ends of the plate being bent at an angle to the platewhereby to engage the sides of the casing with a flat surface when thedamper is rocked into closed position, the casing being provided withfelt cushions for engagement by the said bent ends, and with slots inits sides above the trunnions, and a rod having its ends inserted in theslots and against which the upper end of the damper rests: i

2. A ventilator comprising a casing open at itstop and having a sideopening, the casing being provided with a lateral extension at the sideopening adapted to be inserted in a window casement between the sash andthe sill, the top and the bottom of the'extension having cushions offelt for engagement by the sash and the sill, adamper comprising a plateof sheet materiahprovided with trunnions engaging the sides of thecasing, the trnnnions being arranged nearer, to the top of the platethan to the bottom, the ends of the plate being bent at an angle to theplate whereby toengage the sides of the casing with a fiat surface whenthe damper is at its top and having a side opening, the

casing being provided with a lateral exteiision at the side openingadapted to be instarted in a WlIldOW casement between the sash and thesill, a damper for closing the casing comprising a plate provided withtrunnions engaging the sides of the casing,

the trunnions being nearer the top than the bottom of the casing andmeans for varying the inclination of the plate.

4. A ventilator comprising a casing and a damper for closing the casingcomprising a plate provided with trunnions engaging the sides of thecasing, the trunnions being nearer the top than the bottom of thecasing, and means for varying the inclination of the plate. 4

5. A ventilator comprising a casing open at its top and having a sideopening, a damper pivoted in the casing on an eccentric axis for closingthe passage therethrough,

said damper being adapted to be closed by the pressure of the aircurrent, andrnieans for adjusting the extent of opening of the damper.

ROBERT FRANKLIN HUNTER.

Witnesses:

HARRY KELLER, E. E. DAVIS.

